Optical pickup device with two independent light beams and an in

Details Optical pickup device with two independent light beams and an in Optical pickup device with two independent light beams and an in

1998-02-12

1999-12-07

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4437, 369 94, G02B 1300, G11B 700

Patent

active

059995092

ABSTRACT:
An optical pickup or an optical head capable of favorably irradiating a plurality of independent different light beams and receiving return light with a simple structure. The optical pickup is composed of a beam emitting unit for supplying at least two independent light beams, a common light converging optical system for converging the light beams from the beam emitting unit to a recording medium, an integrated prism for guiding each of the light beams from the beam emitting unit incident thereto to the light converging optical system and for providing return light from the recording medium incident thereto with astigmatism, and a light receiving element for receiving the return light provided with astigmatism by the prism.

REFERENCES:
patent: 5105407 (1992-04-01), Ishika
patent: 5293366 (1994-03-01), Ohta
patent: 5615200 (1997-03-01), Hoshino
patent: 5761176 (1998-06-01), Takahashi

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